What are certified loose diamonds?

Answer 1

Certified loose diamonds are diamonds that have been graded by a gemological laboratory. The laboratory carefully evaluates all the qualities of the diamond and includes all the resulting information in a certificate which is called a diamond grading report.Although each gemological laboratory will employ their own particular methods of evaluating a diamond's quality, the following information will often be present on a diamond's certificate given by diamond a supplier:

• Shape
• Measurements
• Weight
• Depth Percentage
• Table Percentage
• Girdle Thickness
• Culet Size
• Polish
• Symmetry
• Clarity Grade
• Color Grade
• Fluorescence
• Comments about Diamond
• Plot of Internal and External Inclusions

The information on a diamond's grading report is then used to determine the value of the diamond, which is why the origin of a diamond's certificate also greatly influences a diamond's price. It is considered common knowledge in the diamond and jewelry industry that certain laboratories issue stricter and what can be described as more accurate reports that are preferred by an increasing majority of jewelers and buyers the world over.

Another Answer

It's also possible that the package of loose diamonds are certified under the Kimberly Process, certifying that the diamonds were mined according to humane principles and cannot be considered as 'blood diamonds'.

The certificate type will be clearly spelled out on the document.